Physical Quantities and Measurement — Flashcards
ICSE · Class 8 · Physics
30 flashcards for Physical Quantities and Measurement (ICSE Class 8 Physics) to test yourself on key terms and facts.
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State the definition of density.
Answer
Density is the mass per unit volume of a substance. Formula: d = M / V Where: - d = density - M = mass - V = volume Unit: kg m^-3 in SI, g cm^-3 in CGS…
A substance has mass 210 g and volume 27 cm^3. Find its density.
Answer
Given: - Mass, M = 210 g - Volume, V = 27 cm^3 Formula: d = M / V Step 1: d = 210 g / 27 cm^3 Step 2: d = 7.78 g cm^-3 Answer: 7.78 g cm^-3…
Why can equal masses of different substances have different volumes?
Answer
Different substances have different densities. A substance with lower density occupies more volume for the same mass. For example, cotton has a much larger volume than lead for equal mass because lead…
State the SI and CGS units of density.
Answer
SI unit of density: kg m^-3 CGS unit of density: g cm^-3 Conversion: 1 kg m^-3 = 10^-3 g cm^-3 1 g cm^-3 = 1000 kg m^-3…
A block of glass is 30 cm long, 25 cm wide, and 2 cm thick. Its mass is 7.5 kg. Find its density.
Answer
Given: - Length = 30 cm - Breadth = 25 cm - Height = 2 cm - Mass = 7.5 kg = 7500 g Step 1: Volume = length × breadth × height Step 2: V = 30 × 25 × 2 = 1500 cm^3 Step 3: Density d = M / V = 7500 g / 1…
State the formula for the volume of a cuboid.
Answer
Volume of a cuboid = length × breadth × height Use this formula for rectangular solids. Unit of volume is cm^3, m^3, or another cubic unit.
A cylinder has radius 3 cm and height 10 cm. Find its volume.
Answer
Given: - Radius = 3 cm - Height = 10 cm Formula: Volume of a cylinder = π × radius^2 × height Step 1: V = 3.14 × 3^2 × 10 cm^3 Step 2: V = 3.14 × 9 × 10 cm^3 Step 3: V = 282.6 cm^3 Answer: 282.6 cm^3…
How is the volume of an irregular solid measured using a measuring cylinder?
Answer
Use the displacement method. Steps: 1. Note the initial water level V1. 2. Immerse the solid gently. 3. Note the final water level V2. 4. Volume of solid = V2 - V1 Formula: V = (V2 - V1) cm^3 This wor…
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